Create a GitHub repository, and store all your SPARQL queries in there (like in this example). If you don't have a GitHub account, go get one. You can also just write down the username and the repository name of somebody else :-)

2

Go to the address bar of this page, and append /api/github_username/repository_name to it. So if I want the API derived from GitHub's username foo and repository bar, I append /api/foo/bar/ to the domain name (/api/foo/bar/api-docs will work too). Now hit enter. Done!